Answer:
$400
Step-by-step explanation:
140 ÷ 35% = 400
 
        
             
        
        
        
Answer:
(2, - 6 )
Step-by-step explanation:
Given the 2 equations 
x =  y + 5 → (1)
 y + 5 → (1)
2x + 3y = - 14 → (2)
Substitute x =  y + 5 into (2)
 y + 5 into (2)
2(  y + 5 ) + 3y = - 14 ← distribute and simplify left side
 y + 5 ) + 3y = - 14 ← distribute and simplify left side
y + 10 + 3y = - 14
4y + 10 = - 14 ( subtract 10 from both sides )
4y = - 24 ( divide both sides by 4 )
y = - 6
Substitute y = - 6 into (1) for corresponding value of x
x = (0.5 × - 6 ) + 5 = - 3 + 5 = 2
Solution is (2, - 6 )
 
        
                    
             
        
        
        
The key word here is *square* in "square flower garden". 
So we need to find the area of the flower garden, and subtract it from the overall area of the yard. The remainder will be how much grass covers the yard.
Area of the Square flower garden:
 7.5 * 7.5 = 56.25
Area of the Entire yard:
25 * 18 = 450
450 - 56.25 = 393.75 square feet of grass